Practice question

The cabin overheats and the heater cannot be shut off even with controls set to cold. Most likely cause?

  1. A discharged fire extinguisher
  2. Low coolant level
  3. A heater control valve stuck open or a failed blend-door actuator stuck in full-heat position
  4. A burned amber lamp

Answer: C — A heater control valve stuck open or a failed blend-door actuator stuck in full-heat position

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